Iodine is a chemical element represented by the symbol I and is essential for human health. It plays a crucial role in the production of thyroid hormones, which help regulate metabolism, growth, and development. A deficiency in iodine can lead to health issues such as goiter and thyroid problems, making it important to include iodine-rich foods like fish, dairy, and iodized salt in our diets. In nature, iodine is found in various forms, often as a part of compounds in seawater and certain minerals. It is also used in medical applications, such as antiseptics and imaging tests, highlighting its versatility beyond nutrition.